(function(){

    var DomReady = window.DomReady = {};

    // Everything that has to do with properly supporting our document ready event. Brought over from the most awesome jQuery. 

    var userAgent = navigator.userAgent.toLowerCase();

    // Figure out what browser is being used
    var browser = {
        version: (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [])[1],
        safari: /webkit/.test(userAgent),
        opera: /opera/.test(userAgent),
        msie: (/msie/.test(userAgent)) && (!/opera/.test( userAgent )),
        mozilla: (/mozilla/.test(userAgent)) && (!/(compatible|webkit)/.test(userAgent))
    };    

    var readyBound = false; 
    var isReady = false;
    var readyList = [];

    // Handle when the DOM is ready
    function domReady() {
        // Make sure that the DOM is not already loaded
        if(!isReady) {
            // Remember that the DOM is ready
            isReady = true;
        
            if(readyList) {
                for(var fn = 0; fn < readyList.length; fn++) {
                    readyList[fn].call(window, []);
                }
            
                readyList = [];
            }
        }
    };

    // From Simon Willison. A safe way to fire onload w/o screwing up everyone else.
    function addLoadEvent(func) {
      var oldonload = window.onload;
      if (typeof window.onload != 'function') {
        window.onload = func;
      } else {
        window.onload = function() {
          if (oldonload) {
            oldonload();
          }
          func();
        }
      }
    };

    // does the heavy work of working through the browsers idiosyncracies (let's call them that) to hook onload.
    function bindReady() {
        if(readyBound) {
            return;
        }
    
        readyBound = true;

        // Mozilla, Opera (see further below for it) and webkit nightlies currently support this event
        if (document.addEventListener && !browser.opera) {
            // Use the handy event callback
            document.addEventListener("DOMContentLoaded", domReady, false);
        }

        // If IE is used and is not in a frame
        // Continually check to see if the document is ready
        if (browser.msie && window == top) (function(){
            if (isReady) return;
            try {
                // If IE is used, use the trick by Diego Perini
                // http://javascript.nwbox.com/IEContentLoaded/
                document.documentElement.doScroll("left");
            } catch(error) {
                setTimeout(arguments.callee, 0);
                return;
            }
            // and execute any waiting functions
            domReady();
        })();

        if(browser.opera) {
            document.addEventListener( "DOMContentLoaded", function () {
                if (isReady) return;
                for (var i = 0; i < document.styleSheets.length; i++)
                    if (document.styleSheets[i].disabled) {
                        setTimeout( arguments.callee, 0 );
                        return;
                    }
                // and execute any waiting functions
                domReady();
            }, false);
        }

        if(browser.safari) {
            var numStyles;
            (function(){
                if (isReady) return;
                if (document.readyState != "loaded" && document.readyState != "complete") {
                    setTimeout( arguments.callee, 0 );
                    return;
                }
                if (numStyles === undefined) {
                    var links = document.getElementsByTagName("link");
                    for (var i=0; i < links.length; i++) {
                        if(links[i].getAttribute('rel') == 'stylesheet') {
                            numStyles++;
                        }
                    }
                    var styles = document.getElementsByTagName("style");
                    numStyles += styles.length;
                }
                if (document.styleSheets.length != numStyles) {
                    setTimeout( arguments.callee, 0 );
                    return;
                }
            
                // and execute any waiting functions
                domReady();
            })();
        }

        // A fallback to window.onload, that will always work
        addLoadEvent(domReady);
    };

    // This is the public function that people can use to hook up ready.
    DomReady.ready = function(fn, args) {
        // Attach the listeners
        bindReady();
    
        // If the DOM is already ready
        if (isReady) {
            // Execute the function immediately
            fn.call(window, []);
        } else {
            // Add the function to the wait list
            readyList.push( function() { return fn.call(window, []); } );
        }
    };
    
    bindReady();
    
})();